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This seemingly shorter chapter is actually quite a challenge (but does not give off the vibes of the meme known from college maths textbooks: "the proof is left for the reader as an exercise" :) especially because the
book-example
repo is always there for cross-checking the work). The hints are very useful and basically showing what to do without revealing the implementation right away.I agree with the assumption of the reader should be able to test drive this feature on their own by now. And, if they do, it will be a very beneficial experience.